* json
* mbstring
* xml
+The following PHP extensions are strongly recommended:
+* openssl
=== Configuration changes in 1.27 ===
* $wgAllowMicrodataAttributes and $wgAllowRdfaAttributes were removed,
module should express a dependency on it.
* Removed configuration option $wgCopyrightIcon (deprecated since 1.18). Use
$wgFooterIcons['copyright']['copyright'] instead.
+* If the openssl and mcrypt PHP extensions are both unavailable, secure
+ session storage (soon to be used for login) will raise an exception. This
+ exception may be bypassed by setting $wgSessionInsecureSecrets = true.
=== New features in 1.27 ===
* $wgDataCenterUpdateStickTTL was also added. This decides how long a user
is deprecated.
* (T33313) Add a preference for watching uploads by default, also applies
to API-based upload tools.
+* $wgJpegPixelFormat was added to override chroma subsampling for JPEG image
+ thumbnails created via ImageMagick. Defaults to 'yuv420', providing bandwidth
+ savings versus the previous behavior on many files.
=== External library changes in 1.27 ===